EP1024716A1 - Flexible lightweight protective pad with energy absorbing inserts - Google Patents

Flexible lightweight protective pad with energy absorbing inserts

Info

Publication number
EP1024716A1
EP1024716A1 EP98912908A EP98912908A EP1024716A1 EP 1024716 A1 EP1024716 A1 EP 1024716A1 EP 98912908 A EP98912908 A EP 98912908A EP 98912908 A EP98912908 A EP 98912908A EP 1024716 A1 EP1024716 A1 EP 1024716A1
Authority
EP
European Patent Office
Prior art keywords
pad
foam
rubber
human body
surrogate
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP98912908A
Other languages
German (de)
English (en)
French (fr)
Inventor
Douglas Toms
Andrew Julian Wnuk
Dimitris Ioannis Collias
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Procter and Gamble Co
Original Assignee
Procter and Gamble Co
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Procter and Gamble Co filed Critical Procter and Gamble Co
Publication of EP1024716A1 publication Critical patent/EP1024716A1/en
Withdrawn legal-status Critical Current

Links

Classifications

    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/015—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches with shock-absorbing means
    • A41D13/0158—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches with shock-absorbing means having ventilation features
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/0506—Hip
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D31/00—Materials specially adapted for outerwear
    • A41D31/04—Materials specially adapted for outerwear characterised by special function or use
    • A41D31/14—Air permeable, i.e. capable of being penetrated by gases
    • A—HUMAN NECESSITIES
    • A41—WEARING APPAREL
    • A41D—OUTERWEAR; PROTECTIVE GARMENTS; ACCESSORIES
    • A41D13/00—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches
    • A41D13/05—Professional, industrial or sporting protective garments, e.g. surgeons' gowns or garments protecting against blows or punches protecting only a particular body part
    • A41D13/055—Protector fastening, e.g. on the human body
    • A41D13/0556—Protector fastening, e.g. on the human body with releasable fastening means
    • A41D13/0575—Protector fastening, e.g. on the human body with releasable fastening means in an openable pocket
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10T—TECHNICAL SUBJECTS COVERED BY FORMER US CLASSIFICATION
    • Y10T428/00—Stock material or miscellaneous articles
    • Y10T428/22—Nonparticulate element embedded or inlaid in substrate and visible

Definitions

  • the present invention relates to protective padding for the human body.
  • the present invention has further relation to such protective padding that is lightweight, impact-absorbent, flexible, and breathable.
  • Hip pads, and other protective padding have been used for protecting the human body from damage due to impact from falls, accidents, sports, and other related events.
  • bone fracture as a result of accidental falling is a common occurrence with elderly people, with people who have a osteoporosis, and people who are unsteady on their feet and have difficulty in walking.
  • elderly people, especially those with osteoporosis bone fractures are very difficult to repair, and it is highly desirable to prevent them from occurring in the first place.
  • a variety of protective padding and garments have been made available in the past, but all with some shortcomings.
  • a typical piece of protective wear is a pad that is either permanently fixed to a garment, or that slips into a pocket in the garment, or held in place by straps or a skin-safe adhesive so that the pad is positioned over a damage-prone area of the body.
  • Such a damage-prone area especially in the elderly, is the hip area.
  • Hip fracture which occurs in 2 to 3% of cases involving elderly fallers, generally involves fracture of the proximal end of the femur. This part of the femur consists of a head, neck, greater trochanter, and lesser trochanter.
  • the greater trochanter projects outward at the most lateral area of the hip region arid, being so located, is subjected to the brunt of impact force arising from a fall, in particular a sideways fall, onto the hip.
  • pads are typically fixed to the inside of clothing in the area that covers the hips, or are placed in pockets made in the clothing at the hip area. More specifically, the pads are typically positioned such that they overlie the greater trochanter, or, in the case of certain types of force or energy shunting pads, surround the greater trochanter without actually covering it.
  • the velocity at which a falling human torso impacts a hard surface such as a tile floor can vary from about 2.0 to about 4.5 meters/second. Average velocities of about 2.6 meters/second have been cited by researchers (S.N. Robinovitch, J. Biomech. Eng. Vol. 9, pp 1391-1396, 1994) who have measured the speed of human volunteers falling on their hips. Estimates of the force delivered to an unpadded greater trochanter during a fall also range widely from about 5700 Newtons to 10,400 Newtons (J. Parkkari et al., J. Bone and Mineral Res., Vol. 10, No. 10, pp 1437-1442, 1995).
  • the Lauritzen pad reduced peak femoral force from about 5770 Newtons to about 4800 Newtons or only about 17%.
  • a hip protector product based on the Lauritzen pad has been commercialized in Denmark by Sahvatex (a joint venture between Sahva A/S and Tytex A S) under the tradename SAFEHIPTM.
  • the hip protectors which are oval-shaped structures containing plastic hard shells, are sewn into a pair of cotton underwear.
  • pads must also provide other benefits to reinforce wearer compliance. These are related to both appearance and wearer comfort and include attributes such as maximum thickness, thickness profile, weight, breathability, flexibility, and conformability to the body, Prior pads have had many shortcomings in these areas.
  • hip pads no thicker than about 25.4 mm (one inch), and more preferred are those about 19 mm (3/4 inch) maximum thickness or less. Thickness profile is also important. Preferred are pads which are tapered from the area of maximum thickness to the perimeter such that neither the pad nor the pad edges show under normal clothing.
  • 95 perimeter thickness range around the pad of 12.77 mm (1/2 inch) or less is generally preferred. Even more preferred is a perimeter thickness range of 6.35 mm (1/4 inch) or less. Still even more preferred is a perimeter thickness range of 3.18 mm (1/8 inch) or less.
  • pad weight is a concern. Preferred are pads less than about 300 grams each (600 grams per 100 pair). Even more preferred are pads which weigh less than about 200 grams each (400 grams per pair). Most preferred are pads which weigh less than about 100 grams each (200 grams per pair).
  • Typical foam pads are made from closed cell foams which 105 do not pass moisture or perspiration from the body.
  • such pads are thermal insulators and do not dissipate body heat effectively. This leads to even more perspiration and moisture buildup under the pad which can damage the skin of elderly wearers.
  • Preferred pads thus have substantial open area, preferably at least about 5% or more, and more preferably about 10% or more, to permit evaporation of perspiration and to vent body heat.
  • a new, improved protective padding that provides increased impact resistance in a relatively thin, lightweight pad. Increased impact resistance is maintained while providing breathability to prevent heat buildup and the associated discomfort. Additionally, this new pad provides for flexibility and conformance to the part of the human body being protected without any adverse impact on its protective qualities.
  • a protective pad for protecting a predefined area of a human body against impact, the pad having a surface and a thickness, the pad comprising a layer of high density closed-cell polymer foam on the outer surface of the pad away
  • the high density foam has a density of from about 128 to about 192 kg per cubic meter (about 8 to about 12 pounds per cubic foot) and preferably about 160 kg per cubic meter (about 10 pounds per cubic foot).
  • the high density foam typically has a Shore 00 Durometer hardness from about 72 to about 95.
  • the low density foam typically has a density of
  • the low density foam typically has a Shore 00 Durometer hardness from about 40 to about 70.
  • the layers are fixed together to provide a relatively lightweight pad providing relatively high resistance to impact forces and relative comfort to the user.
  • the pads of the current invention have one or more recesses to accept additional energy absorbing materials in the form of plugs or inserts.
  • the recesses may be cut into the pad from the outer side of the pad extending a portion of the way through the pad, or situated within the internal structure of the pad and covered by the inner and outer foam layers. These recesses are generally located in or around the central area of the pad.
  • damping refers to a material's ability to dissipate impact energy internally, wherein much of the energy used to deform the material is dissipated directly into heat.
  • the additional energy absorbing insert material or materials are selected from those groups comprising polyolefin or other polymeric foams, resilient rubber foams, high damping
  • Disposable, one time use pads can also be constructed in accord with the current invention.
  • the recess or recesses are filled with a crushable, non-resilient material such as
  • the pad may have a plurality of score lines across the outer surface and partially through the thickness so as to provide substantial flexibility and conformability to the area of the human body covered by the pad, without significantly affecting resistance to impact forces.
  • the scorelines may
  • the pad 150 run through the insert material or materials or be positioned such that they do not run through the insert material or materials.
  • the pad may also have a plurality of open areas on the surface and completely through the thickness so as to provide for breathability and dissipation of heat from the area of the human body covered by the pad, while maintaining significant resistance to impact forces.
  • the pad weighs less than about 100 grams and has a maximum preferred
  • the overall size of the pad or area covered by the pad may range from about 96.7 to about 387.0 square cm (about 15 to about 60 square inches).
  • the percentage of open area can range from about 5% to about 50% depending upon the overall size of the pad. In general, the pad's percentage of open area is selected so as to provide maximum ventilation while still providing about 40% or more peak force reduction as measured in a surrogate
  • pads of the present invention meet or excede the 40% peak force reduction target at a pad weight of 100 grams or less; a minimum 40% force reduction is key to the present invention.
  • the ratio of % peak force reduction, as measured in a surrogate hip drop impact test, to pad weight in grams is about 0.4 percent per gram. More preferred are pads which meet or excede the 40% target at pad weights of 50 grams or less thereby providing at least 0.8%
  • the preferred range of the ratio of percent force reduction per gram weight of pad is from about 0.25 percent per gram to about 8.00 percent per gram. This ratio is more preferably from about 0.40 percent per gram to about 6.00 percent per gram.
  • Such pads can be either permanently or removably attached to a garment.
  • the garments are preferably made of fabric which promotes wicking of perspiration buildup away from the human body.
  • Figure 1 is a plan view of a protective pad of the present invention.
  • Figure 2 is a partial cross-sectional view through lines 2-2 of Figure 1.
  • Figure 3 is a plan view of an alternative embodiment of a protective pad of the present invention.
  • Figure 4 is a perspective view of the hip pad of Figure 1 showing the pad in a flexed position.
  • Figure 5 is a plan view of another alternative embodiment of a protective pad of the present 185 invention.
  • Figure 6 is a partial cross-sectional view through lines 6-6 of Figure 5.
  • Figure 7 is a plan view of another alternative embodiment of a protective pad of the current invention in which the insert is completely encapsulated by the high density and low density foam layers.
  • Figure 8 is a partial cross-sectional view through lines 8-8 of Figure 7.
  • the protective pad 10 is relatively lightweight, and is relatively thin (less than 25 mm in thickness, but most preferably 19 mm or less). It also may be relatively flexible and contoured as required depending on specific use, as will be described in more detail hereafter.
  • the pad 10 has a high degree of open area through its thickness for breathability while maintaining significant impact resistance, as shown by holes 12. The present pad 10 also effectively reduces the force of an impact
  • Figure 1 further shows the placement of an energy absorbing insert, segmented by scorelines 14 into four sections A, B, C, and D, forming a square insert located at about the center of the pad.
  • the shape of the insert can be circular, oval, rectangular, triangular, pentagonal, hexagonal or any other shape.
  • High density layer 16 forms the
  • low density layer 18 forms the inside surface of the pad.
  • the pad 10 may be made in a variety of shapes based on the particular desired style and application, such as rectangular (as shown in Figure 3), square, round, oval and the like. Multiple inserts E, F, G, and H are shown located about the center of the pad; one skilled in the art would envision a variety of other positions and configurations for these inserts.
  • holes 12 are shown located about the center of the pad; one skilled in the art would envision a variety of other positions and configurations for these inserts.
  • holes 12 are shown located about the center of the pad; one skilled in the art would envision a variety of other positions and configurations for these inserts.
  • scorelines 14 provide for flexibility and conformability to the protected area of the human body.
  • Holes 12 for breathability and dissipation of body heat under the pad can range from about 3.18 mm to about 25.4 mm in diameter depending on the levels of breathability and impact resistance desired.
  • Other shaped holes such as ovals, squares, and the like can also be employed.
  • Pad 10 may be reticulated by slicing partially through its thickness, producing scorelines 14. Scorelines 14 are cut preferably from a depth of about 1/4 to 3/4 of the overall pad
  • Scorelines 14 are cut or molded into the pad from the outer surface or high density foam side of the pad. This makes the pad very flexible and able to conform to a wide range of shapes and sizes. The flexibility imparted by scorelines 14 is shown in Figure 4.
  • the pattern and spacing in which the scorelines are applied can be varied. For illustrative,
  • Figures 1, 3, and 4 show the scorelines cut at + or - 45 degrees to the straight edges of the pads and running through the centers of the holes in the pads.
  • the scorelines can also be cut at 90 degrees to the straight edges of the pad or any angle between + and - 45 degrees and 90 degrees to the edges.
  • the scorelines can run through the holes, between the holes, or in combinations through and between the holes.
  • the scorelines need not be cut as straight lines parallel and perpendicular to
  • 230 one another as shown in Figures 1, 3, and 4. They can also be cut in a fan shaped array from one side of the pad. They can be curved, sinusoidal, or zigzagged across the pad. Preferred spacing between the scorelines lies between about 6.53 mm and about 50.8 mm. Even more preferred spacing between the scorelines lies between about 12.77 mm and about 25.4 mm.
  • Figure 5 shows yet another embodiment of the current invention, in this case a pad
  • the pad is made with at least two different types of foam materials plus one or more insert materials placed in the pad recess or recesses.
  • the outer impact layer 16 is a stiff high density material, preferably a closed-celled polymer foam, for example Voltek LI 000 polyethylene foam (Voltek, Lawrence, Massachusetts 01843). According to the manufacturer, this material has a density
  • the inner layer 18 is a soft low density cushion material, also preferably a closed-cell polymer foam, for example Sentinel MC3800 polyethylene foam (Sentinel Products Corporation, Hyannis, Massachusetts 02601) . According to the manufacturer, MC3800 foam has a
  • the outer layer 16 absorbs impact force via compression and shunts impact force to the perimeter of the pad and is stiff enough to prevent the pad from bottoming out when under impact, while the inner layer 18 provides comfort and the degree of flexibility
  • the pad laminate 10 can be made by laminating the two layers together and then shaping it by mechanically grinding it, or using shaping rolls and a skiving blade. Alternatively, the pad can be made by heating the two layers and compressing them together under heat and pressure. Such manufacturing methods are known to those skilled in the art.
  • the foam layers are closed cell foams, preferably polyolefin closed cell foams, but other materials with similar properties can also be employed.
  • Suitable polyolefin closed cell foams are derived from low density polyethylenes (LDPE), linear low density polyethylenes (LLDPE), medium density polyethylenes (MDPE), high density polyethylenes (HDPE), ethylene-vinyl acetate copolymers (EVA), ethylene methyl acrylate copolymers (EMA), ethylene ionomers, polypropylene
  • polypropylene copolymers are preferred because they do not absorb water or perspiration, nor support microbial growth, and are generally non-irritating and non- sensitizing to the human skin.
  • Suitable other materials can include rubber foams derived from natural rubber, butyl rubber, polyisoprene, polybutadiene, polynorbornene, styrene-butadiene, neoprene, nitrile rubber, and related rubber materials, polyurethane foams, and plasticized polyvinylchloride
  • PVC 265 foams.
  • the other materials like the polyurethanes or rubber foams, can perform at desirable impact resistance levels, care must be taken in selecting such materials for pads to be used in direct or indirect contact with human skin.
  • Special grades of each known to those skilled in the art, can be formulated to inhibit the absorption of water or perspiration, to prevent microbial growth, and to prevent skin irritation and sensitization, all of which lead to user discomfort or are detrimental
  • the outer layer 16 has a density of from about 128 to about 192 kg per cubic meter (about 8 to about 12 pounds per cubic foot) with about 160 kg per cubic meter (about 10 pounds per cubic foot) being the preferred density
  • the inner layer 18 has a density of from about 32 to about 80 kg per cubic meter (about 2 to about 5 pounds per cubic foot) with about 64 kg per cubic meter (about 4
  • 275 pounds per cubic foot being the preferred density.
  • the preferred values result in a combination of significant comfort and impact resistance in one pad. Additionally, providing a top or outer high- density layer with a thickness of at least 50 percent of the overall pad thickness maximizes performance of the pad.
  • 280 can be selected from various materials, including (1) polyolefin or other plastic foams, (2) resilient rubber foams, (3) high damping rubbers, (4) high damping polyurethane compositions, (5) curative polyurethane gels, (6) high damping polyvinylchloride plastisol gels, (7) viscoelastic foams, or (8) resilient thermoplastic honeycomb laminates.
  • Preferred polyolefin or other plastic foams are closed cell foams, selected from the group including low density polyetiiylenes (LDPE), linear low density polyethylenes (LLDPE), medium density polyethylenes (MDPE), high density polyethylenes (HDPE), ethylene-vinyl acetate copolymers (EVA), ethylene methyl acrylate copolymers (EMA), ethylene ionomers, polypropylene and polypropylene copolymers.
  • LDPE low density polyetiiylenes
  • LLDPE linear low density polyethylenes
  • MDPE medium density polyethylenes
  • HDPE high density polyethylenes
  • EVA ethylene-vinyl acetate copolymers
  • EMA ethylene methyl acrylate copolymers
  • EMA ethylene ionomers
  • the hardness or compression strength of the polyolefin or other plastic foam insert or inserts is less than that of the high density outer foam layer of the pad, preferrably less than about 72 as measured on the Shore 00 Durometer scale.
  • Resilient foamed rubber inserts can be derived from natural rubber, butyl rubber, polyisoprene, polybutadiene, polynorbomene, styrene-butadiene, neoprene, nitrile rubber, and related rubber materials, polyurethane foams, and plasticized polyvinylchloride (PVC) foams. If the resilient foamed rubber insert is exposed to view on the outer side of the pad, it is generally preferred to select a closed cell foam to prevent water absorption during laundering. It is generally preferred that the
  • 300 hardness of the foamed rubber inserts is less than that of the high density outer foam layer of the pad, preferrably less than about 72 as measured on the Shore 00 Durometer scale.
  • High damping rubbers include those families of solid rubber materials characterized by high loadings of oils, plasticizers, and fillers such as carbon black. The rubber itself can be based on
  • 315 of such materials derived from polynorbomene and butyl rubber can be obtained from Rubber Associates, Inc. (Barberton, Ohio 44203) in hardness ranges from Shore A Durometer 70 to about 30.
  • Preferred for the the current invention are high damping rubbers having a Shore A Durometer hardness of 50 or less. Even more preferred are high damping rubbers having a Shore A Durometer Hardness of about 40 or less.
  • High damping polyurethane compositions are formed by the reaction of slightly branched, substantially linear polyols having hydroxyl endgroups and number average molecular weights in the range of 600 to 1200 grams per mole with an aromatic di-isocyanate in less than stoichiometric amount.
  • Compositions of this type are disclosed in U.S. Patent 4,346,205 herein
  • Sorbothane® 325 incorporated by reference. Similar materials can be obtained commercially under the tradename Sorbothane® from Sorbothane, Inc. (Kent, Ohio 44240). Although it is a solid, Sorbothane® offers quasi-liquid properties which enable it to exhibit high mechanical damping and energy absorption. It is available in hardnesses ranging from about 70 on the Shore 00 Durometer scale to about 30. Sorbothane® itself can function as an effective pad in reducing the force of impact on the body, but
  • Curative polyurethane gels are often used to replicate the properties of human tissue and skin. They have excellent energy damping properties and resilience.
  • One family of curative polyurethane gels are derived from 3 component liquid material systems comprising an "A" component described as an aromatic diisocyanate terminated glycol solution, a "B” component described as a polybutadiene polyol solution, and a "C” plasticizer component described as a mixture
  • a typical formulation is made up from 50 parts by weight "A” component, 100 parts by weight “B” component, and from zero to 200% by weight of the total A/B mixture.
  • Such gels are manufactured by BJB Ente ⁇ rises, Inc. (Garden Grove, California 92643) under the tradename FlabbercastTM.
  • Other families of curative polyurethane gels can be derived from different 3 liquid component systems.
  • An example is Skinflex IIITM, also obtained from BJB
  • the "A” component is described as a aromatic diisocyanate terminated polyoxypropylene glycol mixture
  • the "B” component curing agent is described as a polyol-diamine mixture
  • the "C” plasticizer component is described as a dialkylcarboxylate.
  • the mix ratio is 50 parts “A” and 100 parts “B” by weight while the plasticizer “C” can be varied from zero to 50% of the total weight of "A” and "B".
  • Curative polyurethane gels have relatively high densities and pad inserts made from them can be heavy and add weight to the pad. It is possible to lower the weight of the inserts as much as 50% or more by the addition of hollow organic or inorganic fillers, for example hollow glass microspheres, to the gel before it is cured.
  • Hollow organic or inorganic fillers for example hollow glass microspheres
  • ScotchliteTM Glass Bubbles (3M Co., St. Paul, Minnesota 55144) are examples of suitable lightweighting fillers.
  • High damping polyvinylchloride (PVC) plastisol gels are prepared from a major portion 360 of plasticizer and a minor portion of PVC resin.
  • Such plastisols are dispersions of special fine particle size PVC resins dispersed in plasticizing liquids. Additional components such as heat stabilizers, colorants, and other additives known to those skilled in the art of plastisols may also be included.
  • a plastisol is liquid at room temperature. Upon heating to a suitably high temperature, fusion occurs converting the plastisol into a tough homogeneous mass with excellent 365 impact resistance.
  • An example of one such material and its application in a shock absorbing bicycle seat is disclosed in U.S.
  • a suitable plastisol is "Plastomeric Plastisol Ml 430 Clear base” and a suitable plasticizer is "Plastomeric Type B Plasticizer”. Both products are available from Plastomeric, Inc. Waukesha, Wisconsin according to whom, the M1430 Clear Base contains 53% PVC copolymer resin, 27% di-octyl terephalate, 2.5% epoxidized soybean oil, 3% calcium-zinc stabilizers, 7% PVC-based thixotrope, and 7.5% adipate plasticizer-based thixotrope.
  • the fusion temperature range of such plastisols lies between 275° F and 400° F which may lie above the softening points of the preferred polyolefin foams used in the laminated pad of this invention.
  • PVC plastisol gels have relatively high densities and pad inserts made from them can be heavy and add weight to the pad. It is possible to lower the weight of the inserts as much as 50% or more by the addition of hollow organic or inorganic fillers, for example hollow glass microspheres, to the gel before it is cured.
  • Hollow organic or inorganic fillers for example hollow glass microspheres
  • ScotchliteTM Glass Bubbles (3M Co., St. Paul, Minnesota) are examples of suitable lightweighting fillers.
  • Viscoelastic foams are open celled polyurethane-based materials offering high damping properties and high impact and shock abso ⁇ tion capability.
  • the high damping engineered into these materials makes the foams' response to mechanical stress highly sensitive to the rate of deformation. Under low loading rates, the foams slowly deform acting very much like a highly viscous fluid. Under high rates of deformation, as in the case of an impact, the foams act as much stiffer materials. Examples of such materials include the CONFORTM family of viscoelastic foams available from AeroE.A.R. Specialty Composites (Indianapolis, Indiana 46268).
  • foams have densities ranging from about 92.8 to about 102.4 kilograms per cubic meter (about 5.8 to about 6.4 lbs/cubic foot) and room temperature Shore 00 Durometer hardnesses of about 20 or less.
  • viscoelatic foams themselves can make effective shock absorbing pads, they are open celled. This open celled structure will cause them to absorb large amounts of water if washed and make them very difficult to dry afterwards.
  • the preferred thickness range of the viscoelastic foam insert is from about 6.35 mm to about 19.0 mm.
  • Resilient thermoplastic honeycomb laminates consist of a thermoplastic honeycomb core material laminated between two plastic films through use of heat, adhesives or both.
  • honeycomb materials are available from Hexcel Co ⁇ oration (Pleasanton, California 94588) under the tradenames CecoreTM polypropylene and polyester thermoplastic honeycomb, CecoreTM Cush 'n Form polypropylene thermoplastic honeycomb, and TPUTM thermoplastic polyurethane honeycomb sandwich.
  • TPUTM thermoplastic polyurethane honeycomb sandwich has a cell size of 6.35 mm and is available with film facings ranging in thickness from about 0.127 mm to 0.508 mm.
  • the honeycomb sandwich used as the energy absorbing insert 410 may consist of one layer about 12.77 mm thick or two layers each about 6.35 mm thick.
  • the garment fabric can enhance breathability, particularly when combined with a pad with air flow openings. Fabrics which promote wicking of natural moisture away from the skin promote temperature regulation and
  • Cottonwick manufactured by Colville inc. of Winston Salem, North Carolina, is a particularly effective fabric for this pu ⁇ ose. It has a unique knit loop with polymerized silicone coating that wicks moisture into the fabric. The knit loop forms cone shaped capillaries and the silicone coating directs the moisture away from the surface of the fabric into the cones.
  • the pads of the current invention may be permanently affixed to the garment by, for
  • the garment may have pockets
  • a multilayer pad is constructed by first die cutting a piece of MC3800 polyethylene foam (Sentinel Products Co ⁇ oration, Hyannis, Massachusetts, 02601) having a density of 64 kg per cubic meter from 6.35 mm thick sheet such that the piece has two straight sides opposite one another and parallel to one another and two curved sides opposite one another as shown in Figure 7. Eight 12.7
  • This first piece is the skin or wearer side of the pad.
  • a second piece of foam, circular in shape and about 1 14.3 mm in diameter, is die cut from about 12.7 mm thick Minicell L1000 polyethylene foam (Voltek, Lawrence, Massachusetts 01843)
  • This piece also has eight 12.7 mm diameter holes die cut at the same time and having the same spatial arrangement as in the first foam piece. A much larger hole, about 76.2 mm (3.0 inches) in diameter and positioned with its center coincident with the center of the piece, is also die cut at the same time.
  • This second piece is the outside of the pad away from the wearer's body.
  • the laminated assembly is then mechanically machined using a cup shaped grinding wheel to provide smoothly tapering sides to the pad in all directions and to give the laminate a domed or curved cross section with the LI 000 foam residing on the outermost or convex side of the pad.
  • the pad's ability to cushion against impact against a hard surface is measured on a surrogate hip, constructed from polyolefin and neoprene closed cell foams as well as other components, and designed to mimic both the soft tissue response and pelvic response of a human hip in a fall.
  • the surrogate hip is dropped from a distance of about 37.5 cm such that its velocity upon impact with a horizontal steel plate is about 2.7 meters per second.
  • the surrogate hip weighs
  • a 5000 pound load cell measures the force transmitted to the surrogate greater trochanter when the surrogate hip is dropped on the steel plate.
  • the force measured on the surrogate trochanter when the unpadded surrogate hip is dropped and impacts the steel plate is about 6000 Newtons.
  • the SAFEHIPTM pad weighs about 31 grams, which puts the percent force reduction per gram weight of pad at about 1 percent/gram. However, this level of force reduction is well below the minimum 40% force reduction target of the pads of the present invention.
  • the pad of this Example is mounted on the surrogate hip and held in place over the area of the surrogate greater trochanter by means of a stretch fabric covering the outer skin of the hip.
  • Example 2 Foam Laminate Pad with Polyolefin Foam Insert A pad identical to that described in Example 1 is constructed. Into the 76.4 mm diameter and about 12.7 mm deep recess located at the center of the pad, a piece of Plastazote® LD60 low density (3.8 lbs/cubic foot) polyethylene foam (Zotefoams, Inc., Hackettstown, New Jersey 07840)
  • 495 pad weight is therefore about 4.71 %/gram.
  • Example 3 Foam Laminate Pad with Sorbothane® Insert A pad identical to that described in Example 1 is constructed. Into the 76.4 mm diameter and about 12.7 mm deep recess located at the center of the pad, a piece of Shore 00 Durometer 50
  • the force reduction per gram of pad weight is therefore about 0.60%/gram.
  • a pad identical to that described in Example 1 is constructed. Into the 76.4 mm diameter
  • the pad is set aside and the gel allowed to cure and solidify. On completion of the cure cycle, the completed pad weighs about 59 grams. When evaluated on the surrogate hip drop tester, with the
  • the peak force measured on the surrogate trochanter is about 69% less than that measured on the unpadded surrogate hip.
  • the force reduction per gram of pad weight is therefore about 1.17%/gram.
  • Example 2 A pad identical to that described in Example 1 is constructed.
  • a liquid FlabbercastTM formulation comprising 50 parts by weight "A” component, 100 parts by weight “B” component, enough “C” plasticizer to equal 100% by weight of the total A/B mixture, and about 15% ScotchliteTM Glass Bubbles (Product No. K15, 3M Co., St Paul, Minnesota 55144) by total weight of the A/B/C mixture,
  • Example 6 Foam Laminate Pad with Polynorbomene High Damping Rubber Insert A pad identical to that described in Example 1 is constructed. Into the 76.4 mm diameter and about 12.7 mm deep recess located at the center of the pad, a piece of Shore A Durometer 40 hardness polynorbomene high damping rubber (Rubber Associates, Inc., Barberton, Ohio) also
  • Example 7 Foam Laminate Pad with High Damping Butyl Rubber Insert A pad identical to that described in Example 1 is constructed. Into the 76.4 mm diameter and about 12.7 mm deep recess located at the center of the pad, a piece of Shore A Durometer 40
  • Example 8 Foam Laminate Pad with Thermoplastic Polyurethane Honeycomb Sandwich Insert A pad identical to that described in Example 1 is constructed.
  • the peak force measured on the surrogate trochanter is about 56% less than that measured on the unpadded surrogate hip.
  • the force reduction per gram of pad weight is therefore about 2.15%/gram.
  • Example 9 Foam Laminate Pad with Viscoelastic Foam Insert A pad identical to that described in Example 1 is constructed. Into the 76.4 mm diameter and about 12.7 mm deep recess located at the center of the pad, a piece of CONFORTM CF-47 polyurethane foam (about 5.8 lbs./cubic foot and Shore 00 Durometer hardness of about 20) (AeroE.A.R Specialty Composites, Indianapolis, Indiana 46268) also about 76.4 mm in diameter and about 12.7mm thick is attached by means of the same 3M #343 double sided adhesive tape (3M Co., St. Paul, Minnesota 55144) used to laminate the foam layers. The completed pad weighs about 17 grams.
  • CONFORTM CF-47 polyurethane foam about 5.8 lbs./cubic foot and Shore 00 Durometer hardness of about 20
  • 3M #343 double sided adhesive tape 3M Co., St. Paul, Minnesota 55144
  • the peak force measured on the surrogate trochanter is about 66% less than that measured on the unpadded surrogate hip.
  • the force reduction per gram of pad weight is therefore about 3.88%/gram.
  • Example 10 Foam Laminate Pad with PVC Plastisol Gel Insert
  • a pad identical to that described in Example 1 is constructed.
  • a sample of PVC plastisol gel is cut from a Model A10305 seat cushion marked with U.S. Patent 5,252,373. obtained from Sports Med (Birmingham, Alabama 35222).
  • a pad insert is fabricated by first heating the gel to a temperature of about 350 degrees F in a beaker until it is liquified, then pouring the hot liquid into a circular metal mold about 76.4 mm in diameter and about 12.7mm deep, and then allowing the gel to cool to room temperature whereupon it returns to its original soft gel state.
  • the cooled gel about 76.4 mm in diameter and about 12.7mm thick, is removed from the mold and attached to the bottom of the 76.4 mm diameter and 12.7 mm deep recess located at the center of the pad by means of the same 3M #343 double sided adhesive tape (3M Co., St. Paul, Minnesota 55144) used to laminate the foam layers.
  • the completed pad weighs about 61 grams.
  • the peak force measured on the surrogate trochanter is about 71% less than that measured on the unpadded surrogate hip.
  • the force reduction per gram of pad weight is therefore about 1.16%/gram.

Landscapes

  • Engineering & Computer Science (AREA)
  • Textile Engineering (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Physical Education & Sports Medicine (AREA)
  • Professional, Industrial, Or Sporting Protective Garments (AREA)
  • Laminated Bodies (AREA)
  • Bedding Items (AREA)
  • Details Of Garments (AREA)
EP98912908A 1997-03-14 1998-03-06 Flexible lightweight protective pad with energy absorbing inserts Withdrawn EP1024716A1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
US08/818,050 US6093468A (en) 1997-03-14 1997-03-14 Flexible lightweight protective pad with energy absorbing inserts
US818050 1997-03-14
PCT/US1998/004473 WO1998041118A1 (en) 1997-03-14 1998-03-06 Flexible lightweight protective pad with energy absorbing inserts

Publications (1)

Publication Number Publication Date
EP1024716A1 true EP1024716A1 (en) 2000-08-09

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US (1) US6093468A (cs)
EP (1) EP1024716A1 (cs)
JP (1) JP2001515548A (cs)
KR (1) KR100368782B1 (cs)
CN (1) CN1250354A (cs)
BR (1) BR9808230A (cs)
CA (1) CA2282471C (cs)
CZ (1) CZ290894B6 (cs)
HU (1) HUP0001472A3 (cs)
IL (1) IL131587A (cs)
NO (1) NO994264L (cs)
NZ (1) NZ503933A (cs)
WO (1) WO1998041118A1 (cs)

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KR100368782B1 (ko) 2003-01-24
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BR9808230A (pt) 2000-05-16
CA2282471C (en) 2005-02-15
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NO994264D0 (no) 1999-09-02
US6093468A (en) 2000-07-25
IL131587A0 (en) 2001-01-28
KR20000076200A (ko) 2000-12-26
HUP0001472A3 (en) 2000-10-30
HUP0001472A2 (hu) 2000-08-28
NZ503933A (en) 2002-12-20
CA2282471A1 (en) 1998-09-24
WO1998041118A1 (en) 1998-09-24
CN1250354A (zh) 2000-04-12
CZ290894B6 (cs) 2002-11-13

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